Question 1

Which of the following best describes a catabolic pathway?

Accepted Answer

A pathway in which energy is released by breaking down complex molecules into simpler compounds.

Question 2

Which of the following is an example of an anabolic pathway?

Accepted Answer

The synthesis of proteins from amino acids.

Question 3

According to the first law of thermodynamics, which of the following statements is true?

Accepted Answer

Energy can be converted from one form to another, but cannot be created or destroyed.

Question 4

A reaction has a $$\Delta G of$$ $$-30 kJ/$$mol. What does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and can occur spontaneously.

Question 5

Which equation correctly represents the change in free energy for a reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 6

What is the role of ATP in cellular metabolism?

Accepted Answer

ATP provides energy by releasing a phosphate group during hydrolysis.

Question 7

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of a reaction.

Question 8

A competitive inhibitor affects an enzyme by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 9

Which of the following best explains why cells maintain metabolic disequilibrium?

Accepted Answer

Cells constantly exchange materials with their environment, preventing equilibrium.

Question 10

Which of the following is NOT a type of cellular work performed by ATP?

Accepted Answer

Thermal work, such as increasing body temperature.

Question 11

If an enzyme is saturated with substrate, how can the rate of product formation be increased?

Accepted Answer

By adding more enzyme.

Question 12

Which of the following statements about allosteric regulation is true?

Accepted Answer

Allosteric regulation can either inhibit or stimulate enzyme activity.

Question 13

A reaction in which $$\Delta G \u003e 0 is $$best described as:

Accepted Answer

Endergonic and non-spontaneous.

Question 14

Which of the following is a correct statement about feedback inhibition?

Accepted Answer

Feedback inhibition prevents the cell from wasting resources by shutting down a pathway when enough product is present.

Question 15

Which of the following is an example of a coenzyme?

Accepted Answer

NAD$$^+$$ derived from niacin (a vitamin)

Question 16

Which of the following best describes the induced fit model of enzyme action?

Accepted Answer

The enzyme changes shape slightly to fit the substrate more closely, facilitating the reaction.

Question 17

Which of the following is true about the hydrolysis of ATP?

Accepted Answer

It is an exergonic reaction with $$\Delta G = -7.3$$ kcal/mol.

Question 18

Which of the following is a function of cofactors in enzymatic reactions?

Accepted Answer

They assist enzymes in catalyzing reactions, often by stabilizing the enzyme or substrate.

Question 19

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

The active site of the enzyme has a unique shape and chemical environment that matches only specific substrates.

Question 20

Which of the following scenarios best illustrates cooperativity in enzyme function?

Accepted Answer

The binding of one substrate molecule to an enzyme increases the likelihood that additional substrate molecules will bind to other active sites.

Metabolism and Thermodynamics: Foundations for Microbial Metabolism

Study Guide - Practice Questions